Fig. 5. Estimated critical threshold for Cd (mg kg-1) in soils for the actual land use. For arable soils the reference crop is sugar beet. The class boundaries are chosen such that the number of cells in each class is approximately equal.
Fig. 5. Estimated critical threshold for Cd (mg kg-1) in soils for the actual land use. For arable soils the reference crop is sugar beet. The class boundaries are chosen such that the number of cells in each class is approximately equal.